Pindex Heavy Duty Grease Gun Set with G Coupler Quick Release Lock, Manual Pistol Grip Grease Gun Tool with Fittings Ends Nozzle Hose for 400g CartridgeGrease gun with G coupler: The Pindex grease gun with NPT 1 8 inch coupler allows you to easily connect the lubrication equipment in order to lubricate the equipment quickly and without leaking grease. LEAK PROOF DESIGN: The grease gun comes with threads and silicone seals for use with couplers and grease nipples. Once the coupler locks the device, it is no longer easy to leak grease. The coupler is suitable for manual grease guns and other types.